What firewall / security suite or anti-virus do you currently have on the PC - or you have ever had on the PC in the past - any trial ware - like Norton, Mcafee , AVG etc

try in safemode
- try safemode with networking
as the PC starts keep tapping F8 - a menu appears - choose safemode with networking - see if that works ------------------------------------------------------------------------

if that does not work - go back to starting the pc normally
please post the following ping tests------------------------------------------------------------------------ Ping Tests
If you cannot access the internet with this PC, then you will need to paste the results into something like notepad and then copy onto a machine that can access the internet and post the results in a reply here.
Save the file to a USB flash drive or other removable media. Plug it into the working computer with internet access and copy the file and paste here.

Start> Run {search bar in Vista/W7}> type CMD to open a command prompt box
(A new dialogue box - black with white font, will appear on screen ):

Type the following command Ping 192.168.200.1
Post back the results in a reply here
right click in the command prompt box
select all
enter
control key + C key - to copy
then reply here and
control key + V to paste

Type the following commandPing google.com
Post back the results in a reply here
right click in the command prompt box
select all
enter
control key + C key - to copy
then reply here and
control key + V to paste

Type the following commandPing 209.183.226.152
Post back the results in a reply here
right click in the command prompt box
select all
enter
control key + C key - to copy
then reply here and
control key + V to paste

Quote:

For your information only
these tests will check various stages of the connection, the first ping test, ping default gateway checks to see if you still have a connection to the router.
The next two Ping google.com & Ping 209.183.226.152 tests the connection to internet. google is to test by name and the ping test using a number is checking that a connection exists without DNS.
these tests then confirm if there is a dns issue on the connection.

would you post a screen shot of the connections
------------------------------------------------
how to show the IP and DNS settings screen

how to show the IP and DNS settings screen
Start> {search bar in Vista/W7}> run {for XP}> type ncpa.cpl
that should open your "network connections" dialogue box
click on the adapter you want to see the properties information for - "local Area Connection" or "Wireless Network Connection"
right click on the icon - from the menu chooseproperties
click on Internet Protocol Version 4 (tcp/ipv4) entry
click on properties button
Now lets see a screen shot of those settings

To post a screen shot of the active window.
1) hold the Alt key and press the PrtScn key. Open the Windows PAINT application and Paste the screen shot. You can then use PAINT to trim to suit, and save it as a JPG format file.
OR
2) if you are using Vista/Windows 7 you can use the "snipping tool" which is found in Start> All programs> Accessories> Snipping Tool

Hold the Windows key and press R, then type CMD then press Enter to open a command prompt box (A new dialogue box - black with white font, will appear on screen ):
In the command prompt window that opens, type the following commands:

Ipconfig/flushdns
ipconfig/registerdns

If you receive the message The requested operation requires elevation.
Then please open the command prompt as administrator
Start> All Programs> Accessories and then right click on Command Prompt, select "Run as Administrator" to open a command prompt.

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